I am also having issues with a WF-3730 - I followed the instructions in the manual (ie: updating firmware, downloading license application and purchasing activation code). When I try to activate online with the license program I get an unsupported printer message. I have tried multiple versions of the firmware (ie: above and the ones located in the instruction manual for making my printer chipless .... Is there a specific problem with Epson WF 3730's and this method?